Long-Term Maintenance of Arytenoid Cartilage Abduction and Stability During Exercise After Laryngoplasty in 33 Horses

Authors

  • Timothy P. Barnett BSc, BVM&S,

    Corresponding author
    1. Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, UK
    • Corresponding Author

      Timothy P. Barnett, BSc, BVM&S, Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin EH25 9RG, UK.

      E-mail: timothy.barnett@ed.ac.uk

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  • John Mark O'Leary BSc, BVMS,

    1. Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, UK
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  • Timothy D.H. Parkin BSc, BVSc, PhD, Diplomate ECVPH, FHEA,

    1. Boyd Orr Centre for Population and Ecosystem Health, School of Veterinary Medicine, University of Glasgow, Glasgow, UK
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  • Padraic M. Dixon MVB, PhD,

    1. Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, UK
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  • Safia Z. Barakzai BVSc, MSc, DESTS, Diplomate ECVS

    1. Royal (Dick) School of Veterinary Studies, Easter Bush Veterinary Centre, University of Edinburgh, Roslin, UK
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  • Clinical research performed by the authors based at the Royal (Dick) School of Veterinary Studies, Edinburgh. Authors at both institutions performed the statistical analyses.
  • Presented in part at the 50th British Equine Veterinary Association Congress, Liverpool, UK, September 9, 2011.

Abstract

Objectives

To (1) assess long-term maintenance of arytenoid cartilage abduction (ACA) after laryngoplasty (LP); and (2) correlate the residual grade of ACA and postoperative abductory loss with arytenoid cartilage stability (ACS) during exercise.

Study Design

Case series.

Animals

Horses re-examined after laryngoplasty (n = 33).

Methods

Of 89 LP horses (2005–2010), 33 had historic ACA data available and upper airway endoscopy at rest and during over-ground exercise (mean, 33 months; range, 4–71 months) after surgery. ACA grade at 1 and 6 weeks postoperatively were correlated to long-term ACA grade. Effects of long-term ACA grade and magnitude of postoperative abductory loss on ACS during exercise were investigated.

Results

Median ACA grade at 1 week (n = 33) was 2, reducing to grade 3 by week 6 (n = 16). Grade 3 abduction was maintained in the long-term. Correlation between ACA at 1 week and the long-term was poor (ρ = .43, P = .1), but there was good correlation between week 6 and long-term (ρ = .89, P < .001). Arytenoid cartilage instability was observed during exercise in 7/33 of horses, and not significantly associated with the ACA grade (P = .50), or the number of grades of ACA lost (P = .64).

Conclusions

Limited abductory loss occurs after 6 weeks postoperatively. Resting ACA grade was not a useful predictor of ACS during exercise.

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